Then you didn't read the post I was originally replying to.
Namely:
The point I was making is that it doesn't matter if both tanks are in "Tanking Stance" for a difficult primal Fate boss (when BOTH pull extra enmity and PLD wins solely due to the attack chain mechanics), or if they are both in "DPS Mode" - WAR with defiance off and PLD with Sword Oath on (when PLD wins again, but this time largely due to the extra enmity generation provided by Sword Oath).
The only times a WAR should pull more ST threat is if they are spamming Butchers Block or the PLD is purposely avoiding using the RoH combo.
Don't get me wrong, if the WAR is better suited to MT something then the PLD can certainly hold back in terms of enmity generation (though sadly the Riot Blade combo drains your TP a lot quicker then the RoH combo does) but the bottom line is that whilst WARs have substantially higher "spike" ST and AoE enmity generation, they have lower "sustained" enmity generation over the course of a standard fight than an equally-geared PLD. For AoE threat, this is because they will run out of TP and MP quickly. For ST threat, this is because of the rotating attack chain mechanics and additional stance enmity I have described above.
To bring the thread back on topic, it is PRECISELY because of these differences in styles that having both tanks in a party is so desirable. WARs make a perfect OT (they can pick up adds securely and quickly) and PLDs make a perfect sustained MT (they can still weather prolonged periods of heavy damage noticably more easily than WARs). Their buffs/debuffs compliment and stack with each other. Their traditional roles as MT and OT even swap occasionally whenever the party encounters something that deals short bursts of heavy spike damage on a predictable timer (Turn 5!) since WAR's New Inner Beast allows it to have a short burst of reliable damage mitigation every ~25 seconds. THAT is the state of WARs in 2.1 - a valuable member of the party that can tank practically anything in the game if it needs to.